Electrical appliance for actuating and controlling dumb-waiters.



G. H. LARSGN.

ELECTRICAL APPLIANGE POR AGTATING AND- GONTROLLING DUMB WATERS;

APPLICATION FILED JULY 13, 1911A Patented Mar. 25, 12H3.

'cnanhns n. manson, or NEW YORK, n. Y.

EEECTRICAI: HPLIANCE FOB ACTUATING AND CONTROLLING DUMB-WAITERS.

Specication of Let-ters Patentl Patented Mar. 25, 1913.

Applicatinnled uly 18, 1911. Serial No. 639,078.

1'0 au ful/wm t may concern:

^ Be it known that I, CHARLES H. LAizsoN, a citizen of thenUnted States, residing in the borough of- Manhattan, 1n the city,

county, and State of New York, have n- .vented certain new and useful Improvements in Electrical Appliances for Actuating and Controlling Dumb-waiters, of which the following is a specification.

Thelvobject of my invention ifto afford simple but effective means adapted to be applied to dumb-waiter outfit's'already in use as well aste be embodied in new out fits, whereby the dumb waiter may be positively and safely operated and controlled by electricity.

The invention consists in the specific construction and 'arrangement of parts, circuits and connections hereinafter described .and claimed, a. distinguishingfeature being thtJ means employed for automatically opening or cutting out either the elevating circuit or the lowering'circuit when the other circuit is in actual use, as fully set forth.

The accompanying drawing is a diagrammatic representation of my system, the parts being drawn more or lless symbolically, it being understood that I do not limit myself to the identical relative arrangement of circuits and parts shown since it is obvious that various modifications may be resorted to With like result and Without departing from the spirit and intent of my invention in this respect.

With this understanding, M, represents a motor of any suitable form and type connected directly by the conductor m, with the -lsource of electricity, the negative conA ductor being represented by n, said lines m, and n, indicating the main line. Any;

desired source of electricity may be utilized, as, for instance, an ordinary plug connection with an electric light or power circuit, as may be most convenient or expedient. A

second direct motor wire c, connects the motor M, with the electro-magnetic relay A; and a third direct motor wire b, connects it with the electro-magnetic relay B.

The coils of the relay A, are connected by the conductor a2, with the stationary contact a3, and in like manner the coils of the relay B, are connected by the conductor 52, with the stationary contact b3. The contactv on the armature B', is in electrical conv nection through the conductor at, with the yieldable 'terminal Contact a5, connected normally with the wire n, of the main line. Similarly the contact on the armature A", is in electrical connection through the medium of the conductor b4, with the yieldable terminal contact b5, normally electrically connected with the branch conductor n, of the wire n., of the main line. The con ductor 7a4, also connects with the branch Wire Il, through the medium of push buttons d, interposed in the cross connections. Push buttons a, and cross connections are also interposed between the parallel 4branches of the conductor at, at.

On the armature shaft m, of the electric motor M, is mounted a gear wheel m2, which meshes with a gear w, on the worm shaft W, which is journaled, preferably, in the sides of' a cast iron box C, in which is also mounted a worm gear G. Rigidly secured to the shaft g, of this Worm gear G, and external to the box C, is the drum J, to which the hoisting rope t, is secured, said rope passing over` the pulley l, and being secured to the dumb waiter E. i

The parts el, u., represent push buttons or any equivalent circuit closing and opening devices, and are positioned so as to be conveniently operated on each iioor of the building adjacent to the dumb waiter shaft and openings therein. On pressing any one ofv the push buttons a, the up circuit m, M, a', a2, as, at and n, is closed, thereby actuating the motor M, rotating the Worm shaft lV, wheel G, and drinn J, to Wind the rope it, and elevate the dumb waiter lll-the push button being held depressed -unt-il the dumb waiter is opposite the particular' shaft opening desired, and then released, breaking the circuit named, and thereby stopping the motor M,-the worm gearing holding the dumb Waiter in position.v The closing of the up circuit m, M, a', (1,2, a3, at, n, as set forth also energizes the electro-1nagnets of the relay A, causing them to draw the armature A', away from the fixed Contact b3, thereby breaking the down circuit vm., M, b", 7a2, b3, b4, b, and a, and holding it open as long as the up circuit is closed, so that in the event of the depression of any of the push buttons d, (or of any of the push buttons u, for that matter, other than that Erst depressed as above described) the said down circuit a, be, b4, b3, Z22, b, M, and m, will be inoperaln tive a'nd remain so until the up circuitis again opened automatically by the release.

Zit, ZJ, und n, being;` closed, and the motive.

tu: closing of one circuit cute out the other oi* the push butte-rr u, A(ir-et mariee. Viheii beth eireiuizs :ire operi, and one ef the push butteiis al, ie uepreeed, the operation ris reversed, the, down circuit m, M, o", 212, of),

oi. the motor M, reversed, uiiwindiiigthe rope. 7L, from the drum J, and lower) dumb waiter' lwthe closing of the circuit l \(r'". il. t A r.x" j! x rse entii/iiug it eee 1,0 nmguers e. it relay i3, :uid drawing the eriinzxture B, au ,y from the ,fixed Contact at, thereby reu dering the up circuit on, lai, o, uf, a, :uid ln, inoperative as long ne the Suid down Circuit is Closed. lt will thus he Seen that absolute safety is zieezued, einer,

either extremity @iL-its shaft .it will open either one circuit lor the other as the @nee may he 21nd thereby stop the motor M, by reason oi" the engagement one 0r the other of the contacts e, e, :on the dumb waiter with either the spring switch as, er b5, as will be readily perceived by reference to the drewing. i

My means oil' controlling zuid operating zi dumb Waiter are so simple arid inexpensive es to he readily applicable to eutits already u use es Well as to those to he iritelled.

Furtheriuore, the running gear is so smell :md eompeet ti the dumb weiter may he lowered to the rullest extent, the drum J, :uid connections eccupying much less space than the hoisting wheels and ruiming gear heretofore used, and which they are deeieried to Su )ersede i i,

Y`ilfliet l' claim es my invention and desire to secure by Lettere Patent is,

in electric apparatus of the ehurucer des-r the combination of zi dumb waiter,

eens therefor, a motor, two eleceireuire arranged in connection with meter to drive it in opposite directions, ey iii 'one o said circuits, t relay iu the other oireuit, means whereby when one elesed the other. is open, yielduble terminal contacts .uoru'ieflly electrically Connected with the main line Circuit and adapted to be opened by the dumb Weiter. at `is upper and lower limits of tmfv'el,` push buttons in sets, one set for each circuit, one for Glosing one circuit for actuating the motor to elevate 'the dumb waiter und energizing nuigruets oil one relay to brezil; the other leireuit for holding; the one circuit inoperative until the other Circuit is broken, another set of push buttons whereby when both circuits :ire open and one of the latter push buttens depressed, the movement of the dumb Waiter is reversed, and .means on the dumb weiter for eopernitioi'i with said yieldeble terminal contacte whereby one circuit or the other is opened automatically to stop the movcment of the dumb Waiter.

WHAS. H. LARSON.

Vllitnesses Geo. "WM, MIAMI, LILLE. Miur.' l 

